8-1 Building Blocks of Geometry Warm Up Warm Up Lesson Presentation Lesson Presentation Problem of the Day Problem of the Day Lesson Quizzes Lesson Quizzes

8-1 Building Blocks of Geometry Warm Up Solve. 1. x + 1 = = 2x 3. x – 7 = 6 4. = x3x

8-1 Building Blocks of Geometry Problem of the Day Draw a clock face that includes the numerals 1–12. Draw two lines that do not intersect and that separate the clock face into three parts so that the sums of the numbers on each part are the same.

8-1 Building Blocks of Geometry Learn to describe figures by using the terms of geometry.

8-1 Building Blocks of Geometry Vocabulary point line plane line segment ray

8-1 Building Blocks of Geometry The building blocks of geometry are points, lines, and planes.

8-1 Building Blocks of Geometry Additional Example 1: Identifying Points, Lines, and Planes Use the diagram to name the geometric figure. A. three points M, N, and P Five points are labeled: points M, N, P, Q, and R. B. two lines PR and NR You can also write RP and RN.

8-1 Building Blocks of Geometry Additional Example 1: Identifying Points, Lines, and Planes Use the diagram to name the geometric figure. C. a point shared by two lines point R D. a plane plane QRM Use any three points in the plane that are not on the same line. Write the three points in any order. Point R is a point on PR and NR.

8-1 Building Blocks of Geometry Check It Out: Example 1 Use the diagram to name the geometric figure. A. three points S, T, and U Five points are labeled: points S, T, U, V, and W. B. two lines UW and SW You can also write WU and WS. V S U W T

8-1 Building Blocks of Geometry Check It Out: Example 1 Use the diagram to name the geometric figure. C. a point shared by two lines point W D. a plane plane VUT Use any three points in the plane that are not on the same line. Write the three points in any order. Point W is a point on WS and WU. V S U W T

8-1 Building Blocks of Geometry

8-1 Building Blocks of Geometry Additional Example 2: Identifying Line Segments and Rays Use the diagram to give a possible name to the figure. A. three different line segments B. three ways to name the line You can also write BA, CB, and CA. AB, BC, and AC You can also write BA, CB, and CA. AB, BC, and AC C A B

8-1 Building Blocks of Geometry Additional Example 2: Identifying Line Segments and Rays Use the diagram to give a possible name to the figure. C. six rays D. another name for ray AB A is still the endpoint. C is another point on the ray. AB, AC, BC, CB, CA, and BA AC C A B

8-1 Building Blocks of Geometry Check It Out: Example 2 Use the diagram to give a possible name to the figure. A. three different line segments B. three ways to name the line You can also write ED, FE, and FD. DE, EF, and DF You can also write ED, FE, and FD. DE, EF, and DF F D E

8-1 Building Blocks of Geometry Check It Out: Example 2 Use the diagram to give a possible name to the figure. C. six rays D. another name for ray DE D is still the endpoint. F is another point on the ray. DE, EF, DF, FE, FD, and ED DF F D E

8-1 Building Blocks of Geometry Standard Lesson Quiz Lesson Quizzes Lesson Quiz for Student Response Systems

8-1 Building Blocks of Geometry Lesson Quiz Use the diagram to name each geometric figure. 1. three points 2. two lines 3. a point shared by a line and a ray 4. a plane Possible answer: A, B, C Possible answer: F Possible answer: plane AEC Possible answer: AD, CE

8-1 Building Blocks of Geometry 1. Use the diagram to name three points. A. B. C. D. A, B, C Lesson Quiz for Student Response Systems A B C D

8-1 Building Blocks of Geometry 2. Use the diagram to name two lines. A. B. C. D. A, B Lesson Quiz for Student Response Systems A B C D

8-1 Building Blocks of Geometry 3. Use the diagram to name a point shared by a line and a ray. A. A B. B C. C D. D Lesson Quiz for Student Response Systems A B C D

8-1 Building Blocks of Geometry 4. Use the diagram to name a plane. A. plane PQT B. plane PT C. plane UTR D. plane QT Lesson Quiz for Student Response Systems T Q R U P S